Table 1.
Sequence and structure of amino acids and Trp-based peptides.
| Chemicals | Sequence | Structure |
|---|---|---|
| L-Tryptophan; (Trp) | Trp |  |
| L-Phenylanaline; (Phe) | Phe |  |
| Endomorphin-1; (EMP) | Tyr-Pro-Trp-Phe-NH2 |  |
| W-Nle-R-F-NH2; (WRF) | Trp-Nle-Arg-Phe-NH2 |  |
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